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Finding the Fourth Proportional to 620,686.68, 856,939.76 and 406,189.37

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Solution

The fourth proportional to 620,686.68, 856,939.76 and 406,189.37 is: 560,797.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,686.68 : 856,939.76 = 406,189.37 : x
  2. Step 2: Convert to fraction form
    620,686.68/856,939.76 = 406,189.37/x
  3. Step 3: Cross multiply
    620,686.68x = 856,939.76 × 406,189.37
  4. Step 4: Simplify right side
    620,686.68x = 348,079,814,926.71
  5. Step 5: Solve for x
    x = 348,079,814,926.71/620,686.68
  6. Step 6: Final answer
    x = 560,797.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.